I plan on releasing at least one more beta version before we start on release candidates, and there will be a few of those before a final stable version is made available. We have the benefit of using both a framework used on several other sites/apps that has gone through a lot of testing as well as the fact that our IMAP routines where refactored from the ones in Hastymail 1 (which have had years of testing). With that said we still need to test a lot more before I will be comfortable with a stable release.